Insulator



March 1929- J. L. OVERSTALL ET AL ,58

INSULATOR Fiied Feb. 2, 1927 K em WZ rm 5 u J6 ATTORNEYS.

Patented Mar. 19, 1929.

UNITED STATES PATENT orFic-a.

JOSEPH LIONEL OVERSTALL, OF EL CERRITO, AND CHARLES H. SEDGWICK, orBERKE- LEY, CALIFORNIA.

INSULATOR.

Application filed February our invention relates to improvements ininsulators, and it consists in the combinations, constructions, andarrangements, hereinafter described and claimed.

5 An object of our invention is to provide an insulator in which thewire may be secured to the insulator without the necessity of threadingthe entire length of wire thru the opening in the device, and which hasnovel 10 means for preventing the accidental withdrawal of the wire fromthe device.

A further object of our invention is to provide a device of the typedescribed in which the wire receiving opening is shaped for clamping thewire.

A further object of our invention is to provide a device of the typedescribed which is extremely simple in construction and which is durableand eflicient for the pur pose intended.

Further objects and advantages will appear in the followingspecification, and the novel features of our invention will beparticularly pointed out in the appended claims.

' Our invention is illustrated in'the accompanying drawing, forming apart of this application, in which- Figure 1 is a front elevation of thedevice,

Figure 2 is a side elevation of a portion of the device,

Figure 3 is a. section along the line 33 of Figure 1, and a Figure 4 isa top plan view of a portion of the device.

In carrying out our invention, we provide a bolt 1 having a bifurcatedend, forming semi-circular arms 2, for receiving an msulating block 3,the block having an annular groove 4 in which the arms 2 are disposed.Lock nuts 5 secure the device to a cross piece 6 of a telegraph pole,not shown.

The block 3 is provided with a diamond shaped opening 7 therein, thewalls 8 of which are carved in the manner shown in Figures 2 and 3 for apurpose hereinafter described. The block also has a zig-zag slot 9therein which extends from the periphery to the opening 7. Figure 4shows how the slot 9 extends at an angle and how it 18 adapted to bebrought into registration with an inclined opening formed between theendsof the arms 2. The portions of the block disposed adjacent to theopening 7 and slot 9 are built 2, 1927. Serial No. 165.280.

up as at 11 for reinforcing the block adjacent to the cutaway portion.

From the foregoing description of the various parts of the device, theoperation thereof may be readily understood. The slot 9 is aligned withthe opening 10 for permitting a wire 12 to be passed into the opening 7.The block 3 is then rotated into the position shown in Figure l and theweight of the wire will cause it to drop and be wedged between thediamond-shaped sides of the opening 7. It will be noted that the wire isdisposed below the center of the block 3. Any force tending to move thewire toward the right or the left (sceFigure 1) will cause the wire torotate the block until the wedgeshaped portion extends in the samedirection as the pull of the wire. This novel arrangement prevents thewire from working out thru the slot 9 and into contact with one of thearms 2. The wire is inclined to sag between adjacent insulators and itis for this reason that we curve the edges of the opening 7 in themanner shown in Figures 2 and 3. The tapering walls of the opening willclamp the wire 12 and at the same time, the edge of the opening will notbite into the wire.

We claim:

1. An insulator comprising a supporting frame, an insulating blockrotatably carried by said frame and having a diamond-shaped openingtherein, said frame having an opening therein for permitting a wire tobe passed therethrough, said block having a slot extending from the sideof the diamond-shaped opening to the periphery of the block, said wireto be clamped in one of the points of said diamond-shaped opening belowthe pivotal center of said block.

2. An insulator comprising a supporting frame. an insulating blockrotatably carried by said frame and having a diamond-shaped openingtherein, said frame having an opening therein for permitting a wire tobe passed therethrough. said block having a Zig-zag slot extending fromthe side of the diamondshaped opening to the periphery of the block,said wire being clamped by its own gravity at a point of saiddiamond-shaped opening below the pivotal center of said block. wherebylateral forces exerted on said wire will rotate said block in saidframe.

3. An insulator comprising a bolt having a bifurcated end for formingtwo semi-circular arms, the free ends of said arms being spaced fromeach othenan insulating block rotatably carried by said arms and havinga diamond-shaped opening therein, said block having a zig-zag shapedslot extending from the side of the opening to the periphery of thebleak, a. wire being held in a point of i said diamond-shaped openingbelow the pivotal center of said block, whereby lateral 10 forcesexerted on said Wire will rotate said block in said frame.

In testimony whereof. We afiix our signatures. 7

JOSEPH LIONEL UVERSTALL. CHARLES H. SEDGWICK.

